Abstract: An animal training device comprises an elongate body having opposite ends and retaining rings proximate each end to couple the body to a conventional leash. A trigger extends laterally from the body to contact the leash. The trigger is responsive to a force exerted thereon by the leash so that tensioning of the leash activates a sound generator. The sound generator, when activated, emits a sound having a preselected frequency to startle the animal so that it eventually learns to avoid the sound and walk safely at the owner's side.

Abstract: A marking device for accurately positioning two opposing marks on two opposing surfaces, for use in aligning two members in accurate registration with one another. The device is formed of a flexible, foldable, flat sheet, which is folded in half at its midportion. The two halves contain matching patterns of holes such that when the sheet is in its folded configuration the holes at each pattern lie in registration with one another. The two halves of the sheet are marked with corresponding indicia, which label corresponding holes of the two patterns. The opposing end portions of the two halves are each adapted to be removably secured to the structure being marked. Two opposed alignment marks are made by securing a first half of the strip against a first surface and making a mark through one of the holes. With the second half of the strip in registration with the first half, the second half is secured to the second surface.

Abstract: A housing for a surface-mount magnet and magnetically sensitive switch unit pair for use in an intrusion detection device. The switch and magnet units include a generally cylindrical housing member formed with a hollow interior cavity, which contains the switch or magnet. The exterior surface of the housing member is threaded and has an end cap formed to receive a screw driver. The units are installed by screwing the housing member directly into the supporting structure. The housing member of the switch unit is further formed with a laterally projecting positioning surface for postioning the switch unit against a surface of the door or window assembly and determining the depth to which the unit is inserted.

Abstract: A threadably installable intrusion detection unit. The unit has a generally cylindrical housing with an exterior threaded surface and an end portion formed to receive a screw driver. An operative intrusion detection element, such as a magnetic or a reed switch, is contained within the hollow interior of the housing.